This is only possible within the range which is permitted by the power output
and braking power of the engine.WARNINGIf the engine power or engine braking effect is insufficient to maintain the
set speed, the driver must take control of vehicle operation.
Operating Description
Fig. 147
Cruise control system controls
Read and observe on page 148 first.
Overview of the CCS controls » Fig. 147ADeactivate CCS (delete set speed) Stop control (sprung position) Activate ACC (control deactivated)BTake control again a)
/ Increase speedCLaunch control / reduce speeda)
If no speed is set, the current speed is used.
At the start of the control process, the CCS regulates the vehicle to the current
speed, and this speed is shown on the instrument cluster display. The warning
light illuminates in the instrument cluster.
Automatic control interruption
Automatic control interruption occurs if any of the following conditions are
met.
› The brake pedal is operated.
› When one of the brake assist systems (e.g. ESC) intervenes.
› Through an airbag deployment.
WARNING■
Always deactivate the cruise control system after use to prevent uninten-
tional switching on of the system.■
Control may only be resumed if the set speed is not too high for the cur-
rent traffic conditions.
Note
During control, speed can be increased by pressing the accelerator pedal. Re-
leasing the accelerator pedal will cause the speed to drop again to the set
speed.
Adaptive Cruise Control (ACC)
Introduction
This chapter contains information on the following subjects:
Radar sensor
150
Operation
151
Automatic stop-start
152
Operation Overview
152
Start control
152
Stop/resume control
153
Set/change the desired speed
153
Set time interval level
153
Special driving conditions
154
Information messages
155
Adaptive cruise control (from here on referred to only as ACC) can maintain the
set speed or the proximity to the vehicle ahead consistently, without the need
to operate the gas or brake pedals.
The state in which the ACC maintains the speed or the proximity is described
as control from here on.
149Assist systems
Automatic stop-startRead and observe
and on page 150 first.
Vehicles with an automatic transmission can decelerate to a standstill and
start moving again using the ACC.
Decelerate to a standstill
If a vehicle ahead decelerates to a standstill, the ACC will also decelerate your
vehicle to a standstill.
Starting to drive again after a holding period
As soon as the vehicle ahead starts moving again after a holding period, your
vehicle will also move and the speed will continue to be regulated. Control is
automatically disconnected in case of longer holding periods.
Depress the brake pedal.
Operation Overview
Fig. 151
Operating lever
Read and observe
and on page 150 first.
Overview of ACC functions operated with the lever » Fig. 151A Set proximity levelBStart control (adopt current speed) / Reduce speed by 1 km/h at
a time1Activate ACC (control deactivated)2Start control (resume) / increase speed by 1 km/h at a time
(sprung position)3Interrupt control (sprung position)4Deactivate ACC5 Increase speed by 10 km/h at a time6 Decrease speed by 10 km/h at a time
Note
If the lever is set » Fig. 151 from the position directly into the sprung posi-
tion, the current speed is stored and the control process is started.
Start control
Read and observe
and on page 150 first.
Basic requirements for start of control ACC is enabled.
TCS is enabled » page 138, Braking and stabilisation systems .
On vehicles with a manual transmission , the second gear or higher must
be engaged.
On vehicles with an automatic transmission , the selector lever must be in
the D/S position or in the Tiptronic position.
On vehicles with a manual transmission , the current speed must be higher
than approx. 25 km/h.
On vehicles with an automatic transmission , the current speed must be
higher than approx. 2 km/h.
The control be started with the key or by adjusting the lever
» Fig. 151
on page 152 into the sprung position.
Button
›
Press button.
The ACC will adopt the current speed and execute control.
Lever position
›
Set the lever into the sprung position .
The ACC will adopt the current speed and execute control. Should the speed
be stored already, the ACC adopts this speed and executes control.
The warning light illuminates in the instrument cluster when the cruise con-
trol system is switched on.
152Driving
Note■If control is started at a speed of less than 30 km/h on vehicles with an auto-
matic transmission, the speed of 30 km/h is stored. The speed increases auto-
matically to 30 km/h or is regulated with respect to the speed of the vehicle
ahead.■
When TCS is disabled, it will be activated automatically upon starting control.
■
If the TCS is deactivated during control, control is stopped automatically.
Stop/resume control
Read and observe
and on page 150 first.
Stop control
›
Set the lever into the sprung position
» Fig. 151 on page 152 .
or
›
Apply the brake.
Control stops, the speed remains stored.
Resume control
›
Start control » page 152.
WARNINGControl may only be resumed if the stored speed is not too high for the cur-
rent traffic conditions.
Note
Control is also stopped when the clutch is held down for longer than 30 s.
Set/change the desired speed
Read and observe
and on page 150 first.
The desired speed can be set or changed using the control lever » page 152.
The set speed is stored upon releasing the lever or the button on the button
on the lever.
Setting/changing the speed by 10 km/h at a time ( ) - requirements
ACC is enabled.
Increasing the speed by 1 km/h at a time ( ) - requirements
ACC is enabled.
Vehicle control taking place.
Decreasing the speed by 1 km/h at a time (
) - requirements
ACC is enabled.
Vehicle control taking place.
Changing the speed by adopting the current speed (
) - requirements
ACC is enabled.
The vehicle is moving at a speed other than that which is stored.
Note
■
If during control the speed is increased by pressing the accelerator, control is
temporarily stopped. Upon releasing the accelerator, control is automatically
resumed.■
If during control the speed is reduced by applying the brake, control is stop-
ped. Control needs to be restarted in order to resume » page 152.
■
If the vehicle is controlled by a lower speed than the stored speed, then
the current speed is stored the first time the button is pressed. Press the but-
ton again
and the speed is reduced in increments of 1 km/h.
Set time interval level
Read and observe
and on page 150 first.
The proximity to the vehicle ahead can be set with the lever » Fig. 151 on
page 152 or in Infotainment » infotainment manual , chapter Vehicle settings
(CAR button) .
Setting by means of the lever
›
Set the switch into the sprung position or - » Fig. 151
on page 152 .
The display of the instrument cluster shows line
2
» Fig. 149 on page 151 ,
which indicates the proximity.
›
Using the switch on the lever, adjust line
2
to the desired distance
level.
153Assist systems
Towing a trailer
When towing a trailer, the ACC control will be less powerful. The manner of
driving should therefore be adapted to this limitation.
Information messages
Read and observe
and on page 150 first.
The information messages are shown in the instrument cluster display. ACC: No sensor view!
The sensor is dirty or has no “visibility”. Stop the car, switch off the engine and
clean the sensor or remove the obstacle causing the lack of “visibili-
ty” » Fig. 148 on page 150 . Should the ACC still be unavailable after the engine
is restarted, push the lever into
» Fig. 151 on page 152 position. Seek help
from a specialist garage.
ACC not available.
Stop the vehicle, switch off the engine and then start it again. If the ACC is still
not available, push the lever into position . Seek help from a specialist ga-
rage.
Error: ACC
There is an ACC system error. Push the lever into position . Seek help from a
specialist garage.
Speed limit
Increase the speed accordingly and start control » page 152.
Front Assistant
Introduction
This chapter contains information on the following subjects:
Radar sensor
155
Operation
156
proximity warning (dangerous proximity)
156
Warning and automatic braking
156
Activating/deactivating
157
Information messages
157The Front Assistant (from here on only referred to as the system) warns you of
the danger of a collision with a vehicle or another obstacle in front of the vehi-
cle, and tries to avoid a collision or mitigate its consequences by automatically
applying the brakes where necessary.
The area in front of the vehicle is monitored by a radar sensor » Fig. 154 on
page 155 .WARNING■
The system only serves to support and does not relieve the driver of the
responsibility for the vehicle operation.■
The system has physical and system-related limitations. For this reason,
the driver may experience some undesired or delayed system responses in
certain situations. You should therefore always be alert and ready to inter-
vene!
■
Always adapt your speed and safety proximity to the vehicle ahead to the
current visibility, weather, road and traffic conditions.
■
The increased passenger protection afforded through the system must
not tempt you to take greater risks than otherwise – risk of accident!
■
The system does not respond to crossing or oncoming objects.
CAUTION
In case of failure of more than one brake light on the vehicle or on the electri-
cally connected trailer, the system becomes unavailable.
Radar sensor
Fig. 154
Mounting location of the radar
sensor
Read and observe and on page 155 first.
The radar sensor » Fig. 154(hereinafter referred to simply as the sensor) can
detect objects by emitting and receiving electromagnetic waves.
155Assist systems
The pre-warning display can occur in the following situations.› If there is a risk of collision with a moving obstacle at a driving speed range
of approx. 30 km/h to approx. 210 km/h.
› If there is a risk of collision with a stationary obstacle at a driving speed
range of approx. 30 km/h to approx. 85 km/h.
When the advance warning is issued, the brake pedal must be pressed or the
moving obstacle avoided!
Acute alert
If the driver does not react to the advance warning, the system briefly applies
the brake automatically via an active brake intervention to draw attention to
the potential danger of a collision again.
Automatic Braking
If the driver fails to respond to the acute warning, the system starts to apply
the brakes automatically with increasing stopping power in several stages.
Brake Support
If the driver does not brake sufficiently in the event of an impending collision,
the system automatically increases the braking force.
The brake support only occurs as long as the brake pedal is being firmly press-
ed down.
Note
■ If an automatic brake intervention is triggered by the system, the pressure in
the brake system increases and the brake pedal cannot be operated with the
normal pedal stroke.■
The automatic braking interventions can be cancelled by pressing the accel-
erator pedal or by means of a steering intervention.
Activating/deactivating
Read and observe
and on page 155 first.
The function is automatically activated each time the ignition is switched on.
The system should only be disabled in exceptional cases »
.
The system can be activated or deactivated in one of two ways. › In the instrument cluster display
» page 51, Menu item wizard .
› In Infotainment
» Infotainment operating instructions , chapter Vehicle set-
tings (CAR button) .
The following functions can be activated or deactivated separately in infotain-
ment.
› Distance warning
› Advance warning
Once one of these functions has been deactivated, it remains disabled even
after switching the ignition off and on.WARNINGIn the following situations, Front Assistant should be deactivated for safety
reasons.■
When the vehicle is being towed away.
■
When the vehicle is on a rolling test bench.
■
If an unfounded warning was issued or a system action carried out.
■
When on a truck, car ferry or similar.
Information messages
Read and observe
and on page 155 first.
The information messages are shown in the instrument cluster display. Front Assist: No sensor view.
The sensor is soiled or covered.
Stop the vehicle, switch off the engine and clean the sensor or remove the
item causing the lack of visibility » Fig. 154 on page 155 .
If the message appears again after starting the engine, the system should be disabled » page 157 . Seek help from a specialist garage.
Front Assist not available.
The system is not available for an unknown reason.
Stop the vehicle, switch off the engine and then start it again.
If the message appears again after starting the engine, the system should be
disabled » page 157 . Seek help from a specialist garage.
157Assist systems
START-STOP
Introduction
This chapter contains information on the following subjects:
Operating conditions of the system
158
Operation in vehicles with manual gearbox
158
Operation in vehicles with automatic gearbox
159
System related automatic start-up
159
Manually deactivating/activating the system
159
Information messages
160
The START-STOP system (hereinafter referred to as the system) saves fuel and
reduces polluting emissions and CO 2 emissions by turning the engine off, e.g.
when stopping at traffic lights, and starting the engine again when moving off.
WARNING■ Never let the vehicle roll with the engine switched off.■The brake servo unit and power steering only operate if the engine is run-
ning.
Operating conditions of the system
Fig. 156
Engine is automatically switched
off / automatic engine cut off is
not possible
Read and observe on page 158 first.
For system-dependent automatic engine shutdown
to work, the following conditions must be met.
The driver's door is closed.
The driver has fastened the seat belt.
The bonnet is closed.
The driving speed was higher than 4 km.h after the last stop.
No trailer is coupled.
Some additional conditions for the system to function correctly cannot be in-
fluenced or recognised by the driver. Therefore, the system can react differ-
ently in situations which are identical from the driver's perspective.
If, after stopping the vehicle, the check icon
» Fig. 156 appears on the dis-
play, then the conditions for automatic engine shutdown are not met.
Running the engine is essential for the following reasons, for example.
› The engine temperature for the proper function of the system has not yet
been reached.
› The charge state of the vehicle battery is too low.
› The current consumption is too high.
› High air-conditioning or heating capacity (high fan speed, big difference be-
tween the desired and actual interior temperature).
Information about the current status of the system can be displayed in the In-
fotainment display » operating instructions for Infotainment , chapter Vehicle
settings (CAR button) .
Note
■
If the vehicle remains outdoors for a long time in minus temperatures or in
direct sunlight, it can take several hours until the internal temperature of the
vehicle battery reaches a suitable temperature for proper operation of the
START STOP system.■
If the driver's seat belt is removed for more than approx. 30 seconds or the
driver's door is opened during stop mode, the engine will have to be started
manually.
■
After the manual engine start and with a manual gearbox the automatic en-
gine shutdown can take place only when a minimum distance required for the
system function has been covered.
Operation in vehicles with manual gearbox
Read and observe
on page 158 first.
In compliance with the operating conditions, automatic engine shutdown / au-
tomatic engine start takes place as described.
Automatic engine shutdown
›
Stop the vehicle.
›
Put the gear stick into Neutral.
158Driving
›Release the clutch pedal.
Automatic engine shutdown then occurs and the indicator symbol appears in
the display
» Fig. 156 on page 158 .
Automatic engine start›
Depress the clutch pedal.
The automatic re-start process takes place and the indicator symbol
goes
out.
Operation in vehicles with automatic gearbox
Read and observe
on page 158 first.
In compliance with the operating conditions, automatic engine shutdown / au-
tomatic engine start takes place as described.
Automatic engine shutdown
›
Bring the vehicle to a stop and depress the brake pedal.
Automatic engine shutdown then occurs and the indicator symbol appears in
the display
» Fig. 156 on page 158 .
Automatic engine start
›
Release the brake pedal.
The automatic re-start process takes place and the indicator symbol goes
out.
Further information on automatic transmission
Engine shut down takes place when the selector lever is in positions P, D/S , N
and in Tiptronic mode.
When the selector lever is in position P the engine remains shut down after
you release the brake pedal. The engine starts automatically by pressing the
gas pedal or by moving the selector lever into a different mode and releasing
the brake pedal.
If the engine is off due to the automatic and the selector lever is put to the R
position then the automatic starts the engine.
If the gear selector is moved from position R to the position D/S or N the vehi-
cle must reach a speed of more than 10 km / h before the automatic engine
shutdown starts.
There is no automatic engine shutdown when the system detects a vehicle
moving due to a large steering angle.
No automatic engine shutdown takes place when the vehicle is moving at low
speed (e.g. during a traffic jam or when tuning) and remains stationary after
pressing the brake pedal lightly. Automatic engine shutdown takes place if you
press the brake pedal down with more force.
System related automatic start-up
Read and observe
on page 158 first.
When the engine is off, the system can automatically start the engine beforethe desired journey continues. Some possible reasons for this are:
› The vehicle begins to roll, e.g. on a slope.
› The brake pedal has been actuated several times.
› The current consumption is too high.
Manually deactivating/activating the system
Fig. 157
Button for the START-STOP sys-
tem
Read and observe on page 158 first.
Deactivating/activating
›
Press the symbol button
» Fig. 157 .
When start-stop mode is deactivated, the warning light in the button lights up.
Note
■ If the system is deactivated when the engine is turned off automatically,
then the automatic start process takes place.■
Selecting the driving mode Eco when the system is deactivated will automat-
ically activate the system » page 160, Selection of travel mode (Driving Mode
Selection) .
159Assist systems
Information messagesRead and observe
on page 158 first.
The information messages are shown in the instrument cluster display. Start the engine manually!
START MANUALLY
One of the conditions for automatic engine start is not satisfied or the driver's
seat belt is not fastened. The engine must be started manually.
On vehicles with the starter button, the ignition is turned off by the first press of the starter button; the start process is only initiated when the button is
pressed for the second time.
Error: start-stop system
START STOP ERROR
A system error is present. Seek help from a specialist garage.
Selection of travel mode (Driving Mode Selection)
Introduction
This chapter contains information on the following subjects:
Selection
160
Normal Mode
160
Sportmode
160
Ecomode
161
Individualmode
161
By selecting the driving mode, the driving behavior can be adapted to the de-
sired mode of operation.
The following modes of Normal, Sport, Eco, Individual are available.
The set driving mode remains stored even after switching the ignition on and
off.
WARNING■ The system only serves to support and does not relieve the driver of the
responsibility for the vehicle operation.■
Adjust the speed and driving style to the current visibility, weather, road
and traffic conditions.
SelectionFig. 158
Button for selecting the driving mode: Version 1/version 2
Read and observe
on page 160 first.
›
Press the symbol button or
» Fig. 158 .
The menu is displayed on the infotainment screen.
The mode is changed by repeatedly pressing the symbol button or
or in
the Infotainment display » Infotainment operating instructions , chapter Vehi-
cle settings .
If a driving mode other than Normal is selected, then the symbol lights up on
the button or
» Fig. 158 .
WARNINGSetting the driving mode while driving can distract you from other traffic –
risk of accident.
Normal Mode
Read and observe
on page 160 first.
This mode is suitable for common everyday use.
SportmodeRead and observe
on page 160 first.
This mode is suitable for a sporty driving style.
Selecting this mode primarily affects the function of the following systems.
160Driving